I am using DE for a school text book. Every time I use it, while scrolling through pages, large numbers of pages go missing. For example, hitting next page from page 55 will go to page 66. No matter how many times I flip pages back and forth, I cannot access the missing pages. Closing and reopening the software temporarily fixes the issue, but is inconvenient since I have to do it multiple times per session. Is there any way to prevent this??